i think if you look at tamerlan, the older brother, throwing a bomb and charging at a heavily armed group of police in a fire fight, he was not afraid to die and that that may have been actually part of his plan in that moment. so i think you're dealing with someone who's very dangerous. >> rose: we continue with the conversation with two people who are experts on the digital revolution. they are walt mossberg and kara swisher. >> everything is moving in mobile. if you ask compaes lean social network, e-commerce companies, many of them appeared at the conference. the percentage of people doing their readings, transactions, checking with their friends on mobile versus p.c.s or macs is just soaring and i think that's the fundamental underlying headline of everything. >> if you don't have a mobile strategy, a co-hent mobile strategy that makes money you're in trouble. so facebook ran into trouble because people felt they didn't have a mobile strategy then you saw this incredibly aggssive efrt to ueilome, which is their new mobile phone software which i happen to have right here so everybody